docs: fix typos in example
docs: fix typos in example

closes #36

saighost/session,sielay/session,aboutdotme/session,victorenator/session,coolaj86/session,danielgindi/session,tianyk/express-session-review,jasonkarns/session,cnwhy/session,MadisonReed/session,expressjs/session,Jpunt/session,globesherpa/session,fracmak/session,happysj/session,digitalartcrew/session,socialrank/express-session,hl198181/session,tianyk/express-session-research,gabeio/session,cgcardona/session,soulman-is-good/session,mig1098/session,wesleytodd/session